It would depend on HOW Rider "die," look at Aoi form MO. Ep13 could show Rider "dying" then bring her back a few episode later for a HF ending.

Spoiler:

To survive a direct blow from Excalibur ? That will just make Saber look underpower. Besides, it was never explictly stated that the same Servant can be revive for the same war. Game purist might not like that.

Of course, there's a need to see if Shinji survive his Fate Fate. There's a lack of a punch without Sakura poping his head after her back story is revealed should they go for HF for the last 3/4 of the anime.